He had been active at the professional organizations such as Chemical Society of Japan; Society of Polymer Science, Japan; Society of Synthetic Organic Chemistry, Japan; Japanese Society for Biomaterials (President;1996-2000), and journals as Associate Editor of J Biomed Mater Res (1984-2001); Japanese Society for Dental Materials and Devices (committee member, -2001); Japanese Society of Conservative Dentistry; Japan Society for Adhesive Dentistry (Editor in Chief, 1985-1996); International Association for Dental Research; Japanese Society for Artificial Organs (councilor); American Society for Internal Artificial Organs; International Society for Artificial Organs where he contributed greatly in engaging young scientists in research and opening challenging discussions and being controversial to the general opinions at times.Prof. Nakabayashi`s scientific achievements and services to the community have been recognized by several accolades some which are the Distiguished Scientist Wilmer Souder Award (IADR) (1994); Hollenback Memorial Prize (Academy of Operative Dentistry) (1997); Technical Award of Japanese Society of Artificial Organs (2000) and the Medal with Purple Ribbon award by the Japanese Government (2001).